Controlling mechanism for elevator-doors.



H. o. RANDALL. GONTROLLING MEGHANIM FOR ELEVATOR DOORS.

APPLICATION FILED MAY 12. 1910.

' Patented July 11, 1911.

Q wat A TTORNE Y HoRATIo c. RANDALL, or s'AN FRANCISCO, cALrFoRNA. l

.l-To vall it may emem:

Be it known that I, Hon'ATro l ooN'rRoLLING niEcHANrsM Fon' ELEvATonfDoons. 4

C. RANDALL, a citizen of the United States, residing `at `San Francisco, in the countyof San Francisco and State of California, have invented o newl and useful* Improvements `in Control-- equi ped with my improvement; Fig. 2 is ling Mechanism for Elevator-Doors, of which the following is a specication.

. The present invention relates to improvementsin elevator doors, theobject of the invention being, first, to provide means for preventing the Aopening of thel door except when the ioor of the car is -within a certain redetermined distance from a `floor of the uilding. f t

In the accompanying drawing, Flgure 1 is an inside view ofan elevator door an e ge view'of said door; Fig. 3 is a detail view of a cam and the adjacent parts; Fig.

lIrisa detail view of the locking device.

Referring to the drawing, 1 indicates a floorof a building t-hrough Whichextends @an velevator shaft, and 2 indicates a door movableover the edge of the floor adjacent to said shaft and supportedby rollers 3 wruiJiing on a track 4. 5 indicates a car movlablevertically in said shaft. Secured to lsfo one hide of said door is an upwardly extendix. arm @which has a right angled or horizontal extension or slidepiece 7 in the directie-n of the opening movement of the 4 fdoor.

' frame 11 Arevoluble An a rock shaft 14 extending between froilt and rear plates and v10 of the frame l11. Normally said cam extends almost directly downward from' the rock shaft 14,- :ind' in this position, if, by the opening o fI the door, the slidepiece begins to move 4betiieen said cam and roller said 'movementj'thenvcauses said cam to bind on ,Said slidepiece travels between a: its lower side, revoluble upon a equal 'and.parallel...arms. 23, 24, to the ends of which is pivoted a shifter 25, comprising a central portion 26 Abetween said arms, and upper and lower terminal portions27, 28, outside of said arms, and bent away from the central portion 26. The arm 24 ,is eX-4 tended rearwardly beyond its pivot, away from the shifter, and pivoted thereto is a depending rod 29, which extends through u Speciication of Letters Patent. Patented July 11, 1911. Application fue@ lmay 12, 1910. serial No. 560,862.

the floor of the car, and is connected to a lever 30 having a fulcrum 31 secured to4 the under side of the floor of the car. To an intermediate pointy 32 of said lever is pivoted a stem 33 havilig a head 34 adapted to be depressed by the foot of th'e operator. The mode of operation of this portion of the apparatus is as follows: 'Ehe' parts are shown in position in which the cai' is descending and the car lioor is approaching the level of the floor surrounding' an elevator shaft. If the operator wishes to open the door at the floor which he is approaching, he depresses the stem 33 with his foot, which action raises the shifter 25 to a position in which the arms-23, 24, extend horiz'ontally.l Said shifter is thus brought into a position in which the pin 18 on the rocking arm 17 will impinge upon the lowerA inclined portion 28 of the shifter as the, car descends. Thev pin Will thereby be moved along said inclinedportion Lof the shifter and the arm 17 will rock, thereby rocking the rock shaft 14 and moving the cam slightly upward, to allow the slide piece 7 to slide freely between said cam and roller and the door toA open. It'will be observed, however, that although the operator may depress the stem 33, it will not on that account be possible to open the elevator door until the car Hoor approaches a Hoor of the building within'av distance determinedby a position of the car at which the pin 18 is operated upon by one of the inclined parts of the shifter to move the cam to release the slidepiece. If the operator does not Vdepress the stem 33, then no movement of the shifter takes place and consequently nomovement of the cam to release tle slidepiece.

To provide means for preventing the starting of the elevator car unless the door is fully closed, I provide a lever 40 pivoted at 41, between the plates 15, 11, carrying a connected to a cable 43 which passes around 'parallel and equal swinging arms 49 so that it has a so-called parallel movement. Said controller is adapted to impinge upon a roller carried atthe rear end of a'bolt 51, sliding in bearings 52 on'the under side ,of thjeploor of the car, being normally repressed by a spring 53 abutting against a collar 54 on said bolt. 55 'indicates the car controller which has avertical shaft. 56 extended through the Hoor of the car vand carrying thereon a disk 57. Said disk has a recess 58 into which the end of the bolt enters. When it has so entered, it locks the car controller in the position in which there is no power applied to the car to move it in either direction.

The operation of this portion ofthe device is as follows: When the car has come to rest at the Hoor of the building, and the door has been opened, the controller 47 is then moved into a position in which the arms 4'9 extend horizontally, so t-hatsaid controller presses against the roller 5() and causes the bolt 51 to ente-r the recess 58, thus locking the car controller, so that the car cannot be started so long as the door is open. Upon the closing of the door, the' locking controller 47 drops, andthe bolt is released therefrom and is withdrawn from the recess 58 by means of the spring 53.

Since means have been provided for preventing the opening of the door except when the floor of the car arrives at within a certain predetermined distance ofthe lioor of the building, and said means then per- 4mits the door to be opened when the Hoor of the car arrives within that distance of the floor of the building, the spring is *interposed in the cable in order that this may be permitted, for, otherwise, when the motive power was not entirely shut oil", the bolt 5l' could not enter the recess 58, and therefore". the locking controller could not move into Operative position, the cable could not.be drawn upward by the lever, and the lever would prevent the opening of the door.

I claim In combination with a door of an elevator shaft, a slidepiece connected to the door and movable horizontally therewith, `a friction clamp arranged to engagev and clamp,

against movement in the opening direction of the door, said slidepiece at any point thereof, said clamp being inoperative to clam the slidepiece against movement in the c osing direction of the` door, and means carried by the car and adapted to vrender said clamp inoperative only when the car floor arrives within a predetermined distance from the bottom of said door, substantially as described.

In testimony whereof I. have hereunto set my hand in the presence of two subscribing witnesses.

HORATIO C. RANDALL.

l/Vitnesses:

FRANCIS WRIGHT, D. B. RIoHARDs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

. Washington, D. C. 

